Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Multi-Way Conventional loudspeakers with crossovers

Working the crossover for better impedance
Working the crossover for better impedance
Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 24th March 2020, 03:55 PM   #11
Kustomize123 is offline Kustomize123
diyAudio Member
 
Join Date: May 2019
Quote:
Originally Posted by Douglas Blake View Post
I thought you might like to see what can be done with an alternative crossover design for your 2.5 way speakers.

Please note this is not a final design as I still can't locate the files for your specific drivers. This is an example using 3 8ohm "perfect" drivers that are the default in XSim ... please note the impedance curve never dips below 8 ohms.
Thankyou so much for that Douglas!

So I am attaching a file for the tweeter, which is the Vifa DQ25. This file was found in this thread in partsexpress techtalk.

Seas CA18RNX & Vifa DQ25SC16 FRD Files... -

Techtalk Speaker Building, Audio, Video Discussion Forum



And for the Zaph files, I retraced the graphs! I hope I did it right!
Attached Files
File Type: zip DQ25.zip (3.0 KB, 1 views)
File Type: zip Zaph ZA5.zip (10.4 KB, 1 views)
  Reply With Quote
Old 24th March 2020, 05:45 PM   #12
Douglas Blake is offline Douglas Blake  Canada
diyAudio Member
 
Douglas Blake's Avatar
 
Join Date: Nov 2019
Location: Niagara Region Ontario
Quote:
Originally Posted by Kustomize123 View Post
Thankyou so much for that Douglas!

So I am attaching a file for the tweeter, which is the Vifa DQ25. This file was found in this thread in partsexpress techtalk.

And for the Zaph files, I retraced the graphs! I hope I did it right!
I hope you got it right too ... The thumbnails and DXO are for the "stock" crossover with your files. Nothing is changed.

For the moderators ... you really should move this thread to the Multi-Way forum.
Attached Images
File Type: jpg ZA5.3t-crossover.jpg (52.0 KB, 154 views)
File Type: jpg ZA5.3t-Original-crossover.jpg (360.1 KB, 126 views)
Attached Files
File Type: dxo ZA5T.dxo (48.7 KB, 1 views)

Last edited by Douglas Blake; 24th March 2020 at 05:49 PM.
  Reply With Quote
Old 25th March 2020, 12:16 PM   #13
Kustomize123 is offline Kustomize123
diyAudio Member
 
Join Date: May 2019
Quote:
Originally Posted by Douglas Blake View Post
I hope you got it right too ... The thumbnails and DXO are for the "stock" crossover with your files. Nothing is changed.

For the moderators ... you really should move this thread to the Multi-Way forum.
Seems like I traced the wrong graphs and it failed!


I have no idea what I did wrong

Thankyou for trying <3 !
  Reply With Quote
Old 25th March 2020, 02:16 PM   #14
Douglas Blake is offline Douglas Blake  Canada
diyAudio Member
 
Douglas Blake's Avatar
 
Join Date: Nov 2019
Location: Niagara Region Ontario
Quote:
Originally Posted by Kustomize123 View Post
Seems like I traced the wrong graphs and it failed!


I have no idea what I did wrong

Thankyou for trying <3 !
Naaa ... if we can get accurate ZMA and FRD files for your drivers we can easily continue ... but for now, I suggest you investigate an outboard amplifier for your Denon's front channels. The Crown XLS I recommended earlier would be a fine choice.
  Reply With Quote
Old 25th March 2020, 05:03 PM   #15
Kustomize123 is offline Kustomize123
diyAudio Member
 
Join Date: May 2019
Would anyone happen to have ZMA and FRD file for the Zaph ZA5 driver?

http://zaphaudio.com/ZA14W08/ZA14W08-datasheet.pdf


I traced it but seems like I messed up somehow.
  Reply With Quote
Old 25th March 2020, 05:43 PM   #16
system7 is offline system7  United Kingdom
diyAudio Member
 
system7's Avatar
 
Join Date: Aug 2008
Location: Portsmouth UK
Isn't there a 2 way version of this speaker published by ZAph?

Series wire the 2 basses and double coils and resistors in the bass crossover, halve capacitors etc. A TMM.

That will take midbass inpedance up hugely. Might fiddle with the tweeter crossover for higher resistance too.

Not much modelling needed.
__________________
Best Regards from Steve in Portsmouth, UK.
  Reply With Quote
Old 25th March 2020, 06:17 PM   #17
Douglas Blake is offline Douglas Blake  Canada
diyAudio Member
 
Douglas Blake's Avatar
 
Join Date: Nov 2019
Location: Niagara Region Ontario
Quote:
Originally Posted by system7 View Post
Isn't there a 2 way version of this speaker published by ZAph?

Series wire the 2 basses and double coils and resistors in the bass crossover, halve capacitors etc. A TMM.

That will take midbass inpedance up hugely. Might fiddle with the tweeter crossover for higher resistance too.

Not much modelling needed.
They are 8 ohm drivers == 16 ohms in series == 6db drop in output, and that's going to sound very shrill.

Wiring them in parallel drops the impedance to 4 ohms, which is below the 6 ohm recommendation from Denon.

Last edited by Douglas Blake; 25th March 2020 at 06:20 PM.
  Reply With Quote
Old 25th March 2020, 09:40 PM   #18
system7 is offline system7  United Kingdom
diyAudio Member
 
system7's Avatar
 
Join Date: Aug 2008
Location: Portsmouth UK
I know how it works! But why should an MT to series MMT conversion with the same drivers sound shrill? You just turn up the amp a bit. You won't improve the midbass impedance without series wiring of some sort.

I seem to get into deep water with Zaph designs, but really he gets very low impedance even on tweeters. That's because he uses an attenuator after the tweeter filter. Much better, IMO, to put some impedance raising resistance in front of the tweeter filter.

Makes for smaller values on components too.

You don't have to know anything about the drivers to do this conversion, except the DC resistance of the tweeter to remodel for higher tweeter impedance with the same acoustic slope in this case.
__________________
Best Regards from Steve in Portsmouth, UK.
  Reply With Quote
Old 25th March 2020, 11:02 PM   #19
AllenB is offline AllenB  Australia
diyAudio Moderator
 
AllenB's Avatar
 
Join Date: Oct 2008
Working the crossover for better impedance
Quote:
Originally Posted by Douglas Blake View Post
that's going to sound very shrill.
It's easy enough to rectify.
  Reply With Quote
Old 26th March 2020, 02:55 AM   #20
Douglas Blake is offline Douglas Blake  Canada
diyAudio Member
 
Douglas Blake's Avatar
 
Join Date: Nov 2019
Location: Niagara Region Ontario
Yep, an LPad would probably do it... but we still need accurate files.
  Reply With Quote

Reply


Working the crossover for better impedanceHide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Crossover Design: Low Impedance after 5k in the Impedance Curve ikidnextdoor Multi-Way 40 20th March 2020 06:24 AM
Working on some speakers - upgrade crossover? surfdabbler Multi-Way 4 10th September 2019 05:26 AM
Please help passive crossover not working. awdtalon21 Multi-Way 4 1st July 2017 05:02 PM
Which Impedance for Crossover Calculation? The Nominal, the One at Crossover or? T101 Multi-Way 23 10th October 2013 02:10 AM
Working on crossover, wondered about something... BAM Multi-Way 10 20th April 2004 08:03 PM


New To Site? Need Help?

All times are GMT. The time now is 12:00 PM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 14.29%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd.
Copyright ©1999-2020 diyAudio
Wiki